Refactor /calendars into it's own controller

Spec it out too

spec/controllers/calendars_controller_spec.rb

@@ -0,0 +1,32 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe CalendarsController do
+  render_views
+
+  let!(:conference) { create(:conference, splashpage: create(:splashpage, public: true), venue: create(:venue)) }
+  let!(:events) { create_list(:event_scheduled, 2, program: conference.program) }
+
+  describe 'GET #index' do
+    before :each do
+      conference.program.update(schedule_public: true)
+      get :index, format: :ics
+    end
+
+    it 'renders a calendar from conference' do
+      expect(response.body).to match(/#{conference.title}/im)
+    end
+  end
+
+  describe 'GET #index with full format' do
+    before :each do
+      conference.program.update(schedule_public: true)
+      get :index, format: :ics, params: { full: 1 }
+    end
+
+    it 'renders a calendar from events' do
+      expect(response.body).to match(/#{events.first.title}/im)
+    end
+  end
+end